パンテチン

Pantethine/ja

Names
Systematic IUPAC name (2R,2′R)-N,N′-(3,12-Dioxo-7,8-dithia-4,11-diazatetradecane-1,14-diyl)bis(2,4-dihydroxy-3,3-dimethylbutanamide)
Other names Bis-pantethine Co-enzyme pantethine
Identifiers
CAS Number	16816-67-4 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL2104786 N
ChemSpider	4515 Y
PubChem CID	4677
UNII	7K81IL792L Y
InChI InChI=1S/C22H42N4O8S2/c1-21(2,13-27)17(31)19(33)25-7-5-15(29)23-9-11-35-36-12-10-24-16(30)6-8-26-20(34)18(32)22(3,4)14-28/h17-18,27-28,31-32H,5-14H2,1-4H3,(H,23,29)(H,24,30)(H,25,33)(H,26,34) Y Key: DJWYOLJPSHDSAL-UHFFFAOYSA-N Y InChI=1/C22H42N4O8S2/c1-21(2,13-27)17(31)19(33)25-7-5-15(29)23-9-11-35-36-12-10-24-16(30)6-8-26-20(34)18(32)22(3,4)14-28/h17-18,27-28,31-32H,5-14H2,1-4H3,(H,23,29)(H,24,30)(H,25,33)(H,26,34) Key: DJWYOLJPSHDSAL-UHFFFAOYAZ
SMILES O=C(NCCSSCCNC(=O)CCNC(=O)C(O)C(C)(C)CO)CCNC(=O)C(O)C(C)(C)CO
Properties
Chemical formula	C22H42N4O8S2
Molar mass	554.72 g·mol−1
Pharmacology
ATC code	A11HA32 (WHO)
Hazards
NFPA 704 (fire diamond)	2 1 0

パンテチン（ビスパンテチンまたは補酵素パンテチン）はパンテテインの二量体であり、パントテン酸（ビタミンB₅）からシステアミンの付加によって生成される。パンテチンは、当時博士課程の学生であったジーン・ブラウンによって発見された。パンテチンは2分子のパンテテインがジスルフィド結合したものである。パンテテインは体内で補酵素Aを生成する際の中間体である。ほとんどのビタミンB₅サプリメントは、パントテン酸の塩であるパントテン酸カルシウムの形で、用量は5～10 mg/日の範囲である。対照的に、パンテチンは、血中コレステロールとトリグリセリドを低下させるための栄養補助食品として、500～1200 mg/日の用量で販売されている。

栄養補助食品

Pantethine is available in the United States as a dietary supplement because of evidence for lowering elevated LDL-cholesterol and triglycerides and raising HDL-cholesterol. In multiple clinical trials of patients with elevated cholesterol and triglycerides, total and LDL cholesterol were decreased by an average of 12%, triglycerides decreased by 19%, and HDL cholesterol was increased by 9% in clinical trials with daily intakes ranging from 600 to 1200 mg/day.

Physiological effects

Although pantethine can serve as a precursor for generation of vitamin B₅ and consumption of therapeutic amounts of pantethine results in higher circulating concentrations of vitamin B₅, this is not thought to be the mechanism of action. Vitamin B₅ requirements are on the order of 5 mg/day. High doses of vitamin B₅ do not result in the lipid changes seen with pantethine. Two mechanisms of action are proposed for pantethine. In the first, pantethine serves as the precursor for synthesis of coenzyme A. CoA is involved in the transfer of acetyl groups, in some instances to attach to proteins closely associated with activating and deactivating genes. By this theory, either the genes responsible for cholesterol and triglyceride synthesis are suppressed or the genes governing the catabolism of compounds are turned on. In the second theory, pantethine is converted to two pantetheine molecules which are in turn metabolized to form two pantothenic acid and two cysteamine molecules. Cysteamine is theorized to bind to and thus inactivate sulfur-containing amino acids in liver enzymes involved in the production of cholesterol and triglycerides. What is known is that high doses of the related vitamin - pantothenic acid - has no effect on lipids.